[PATCH] remove outdated comments from filemap.c

#include <linux/security.h>

#include <linux/syscalls.h>

/*

 * This is needed for the following functions:

 *  - try_to_release_page

 *  - block_invalidatepage

 *  - generic_osync_inode

 *

 * FIXME: remove all knowledge of the buffer layer from the core VM

 */

#include <linux/buffer_head.h> /* for generic_osync_inode */